From e8942caa233a663155ffec14c1070ad5dbbb9c7b Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Sun, 1 Nov 2026 13:40:12 +0400
Subject: [PATCH] fix(render): preserve object-local point lights on models

---
 .../shaders/triangle.vert                     |  12 ++-
 .../shaders/triangle.vert.spv                 | Bin 20384 -> 20860 bytes
 .../fparkan-render-vulkan/src/asset_mesh.rs   |   6 ++
 .../src/ffi/reflection.rs                     |   1 +
 .../src/ffi/resources.rs                      |   3 +-
 .../fparkan-render-vulkan/src/ffi/smoke.rs    |  12 ++-
 .../src/ffi/smoke_types.rs                    |  12 ++-
 .../fparkan-render-vulkan/src/ffi/tests.rs    |  11 ++-
 apps/fparkan-game/src/main.rs                 |  69 ++++++++++++++----
 apps/fparkan-game/src/terrain_lod.rs          |   1 +
 docs/appendices/knowledge-boundaries.md       |   3 +
 docs/reference/environment-effects.md         |   9 ++-
 docs/reference/render-frame.md                |  17 +++++
 docs/tomes/05-render.md                       |  10 ++-
 14 files changed, 136 insertions(+), 30 deletions(-)

diff --git a/adapters/fparkan-render-vulkan/shaders/triangle.vert b/adapters/fparkan-render-vulkan/shaders/triangle.vert
index 8e04536..3accd2e 100644
--- a/adapters/fparkan-render-vulkan/shaders/triangle.vert
+++ b/adapters/fparkan-render-vulkan/shaders/triangle.vert
@@ -45,7 +45,8 @@ layout(std430, set = 0, binding = 5) readonly buffer MaterialSpecular {
 struct PointLightRecord {
     vec4 position_range;
     vec4 rgb_active;
-    vec4 coefficients_active;
+    vec3 coefficients;
+    uint owner_scope;
 };
 
 layout(std430, set = 0, binding = 6) readonly buffer PointLightBuffer {
@@ -197,6 +198,9 @@ LightingTerms native_material_lighting(
     }
     for (uint index = 0u; index < point_light_buffer.header.x; ++index) {
         PointLightRecord point_light = point_light_buffer.records[index];
+        if (point_light.owner_scope != 0u && point_light.owner_scope != uint(gl_InstanceIndex)) {
+            continue;
+        }
         vec3 to_light = point_light.position_range.xyz - world_position;
         float distance_squared = dot(to_light, to_light);
         float range = point_light.position_range.w;
@@ -209,9 +213,9 @@ LightingTerms native_material_lighting(
             float ndotl = dot(normal, light_direction);
             if (ndotl > 0.0) {
                 float t = (range - distance_to_light) / range;
-                float attenuation = point_light.coefficients_active.x
-                    + point_light.coefficients_active.y * t
-                    + point_light.coefficients_active.z * t * t;
+                float attenuation = point_light.coefficients.x
+                    + point_light.coefficients.y * t
+                    + point_light.coefficients.z * t * t;
                 attenuation = max(attenuation, 0.0);
                 accumulated += ndotl * directional_rgb * point_light.rgb_active.rgb * attenuation;
                 specular += specular_from_light(
diff --git a/adapters/fparkan-render-vulkan/shaders/triangle.vert.spv b/adapters/fparkan-render-vulkan/shaders/triangle.vert.spv
index 439e2a0439a9041547de4a0752980cda375aaa7e..74adcc718f77d03e6d91d84a2ec3a23412c97b29 100644
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diff --git a/adapters/fparkan-render-vulkan/src/asset_mesh.rs b/adapters/fparkan-render-vulkan/src/asset_mesh.rs
index d813b91..f25ab89 100644
--- a/adapters/fparkan-render-vulkan/src/asset_mesh.rs
+++ b/adapters/fparkan-render-vulkan/src/asset_mesh.rs
@@ -859,6 +859,7 @@ fn append_node_fallback_batch(
         indices.push(vertex_index);
     }
     draw_ranges.push(VulkanStaticDrawRange {
+        owner_scope: 0,
         first_index,
         index_count: u32::from(batch.index_count),
         material_index: u16::from(batch.material_index),
@@ -1246,6 +1247,7 @@ fn static_terrain_draw_ranges(
             end_face += 1;
         }
         ranges.push(VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index: u32::try_from(start_face)
                 .map_err(|_| VulkanAssetMeshError::IndexOutOfRange)?
                 .checked_mul(3)
@@ -1299,6 +1301,7 @@ fn static_model_indices_and_ranges(
             indices.push(index);
         }
         draw_ranges.push(VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index,
             index_count: u32::from(batch.index_count),
             material_index: u16::from(batch.material_index),
@@ -1507,6 +1510,7 @@ mod tests {
         assert_eq!(
             mesh.draw_ranges,
             vec![VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 0,
@@ -2038,6 +2042,7 @@ mod tests {
             mesh.draw_ranges,
             vec![
                 VulkanStaticDrawRange {
+                    owner_scope: 0,
                     first_index: 0,
                     index_count: 3,
                     material_index: 0,
@@ -2050,6 +2055,7 @@ mod tests {
                         VulkanStaticDrawRange::NATIVE_DEFAULT_ALPHA_TEST_REFERENCE,
                 },
                 VulkanStaticDrawRange {
+                    owner_scope: 0,
                     first_index: 3,
                     index_count: 3,
                     material_index: 7,
diff --git a/adapters/fparkan-render-vulkan/src/ffi/reflection.rs b/adapters/fparkan-render-vulkan/src/ffi/reflection.rs
index 1a9c9ae..6eb6c67 100644
--- a/adapters/fparkan-render-vulkan/src/ffi/reflection.rs
+++ b/adapters/fparkan-render-vulkan/src/ffi/reflection.rs
@@ -406,6 +406,7 @@ mod tests {
             ],
             indices: vec![0, 1, 2],
             draw_ranges: vec![VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 0,
diff --git a/adapters/fparkan-render-vulkan/src/ffi/resources.rs b/adapters/fparkan-render-vulkan/src/ffi/resources.rs
index 498a472..449750f 100644
--- a/adapters/fparkan-render-vulkan/src/ffi/resources.rs
+++ b/adapters/fparkan-render-vulkan/src/ffi/resources.rs
@@ -687,12 +687,13 @@ pub(super) fn encode_point_lights(
             .chain(light.rgb)
             .chain([if light.active { 1.0 } else { 0.0 }])
             .chain(light.coefficients)
-            .chain([if light.active { 1.0 } else { 0.0 }])
         {
             bytes[offset..offset + std::mem::size_of::<f32>()]
                 .copy_from_slice(&value.to_ne_bytes());
             offset += std::mem::size_of::<f32>();
         }
+        bytes[offset..offset + 4].copy_from_slice(&light.owner_scope.to_ne_bytes());
+        offset += 4;
     }
     debug_assert_eq!(offset, total);
     Ok(bytes)
diff --git a/adapters/fparkan-render-vulkan/src/ffi/smoke.rs b/adapters/fparkan-render-vulkan/src/ffi/smoke.rs
index a016645..c4f0264 100644
--- a/adapters/fparkan-render-vulkan/src/ffi/smoke.rs
+++ b/adapters/fparkan-render-vulkan/src/ffi/smoke.rs
@@ -2105,7 +2105,7 @@ impl VulkanSmokeRenderer {
                         1,
                         range.first_index,
                         0,
-                        0,
+                        range.owner_scope,
                     );
                 }
                 device.device().cmd_end_render_pass(command_buffer);
@@ -2898,6 +2898,7 @@ mod tests {
         };
         let mut ranges = vec![
             VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 7,
@@ -2909,6 +2910,7 @@ mod tests {
                 alpha_test_reference: 17,
             },
             VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 3,
                 index_count: 3,
                 material_index: 9,
@@ -3066,6 +3068,7 @@ mod tests {
     #[test]
     fn geometry_updates_dirty_world_order_on_activation_and_deactivation() {
         let mut ranges = [VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index: 0,
             index_count: 0,
             material_index: 0,
@@ -3253,6 +3256,7 @@ mod tests {
     fn native_transparent_order_is_descending_and_keeps_fixed_pass_slots() {
         let ranges = (0..5)
             .map(|_| super::super::VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 0,
@@ -3278,6 +3282,7 @@ mod tests {
     fn inactive_world_range_is_not_reused_as_a_sort_slot() {
         let ranges = vec![
             super::super::VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 0,
@@ -3289,6 +3294,7 @@ mod tests {
                 alpha_test_reference: 0,
             },
             super::super::VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 3,
                 index_count: 0,
                 material_index: 0,
@@ -3300,6 +3306,7 @@ mod tests {
                 alpha_test_reference: 0,
             },
             super::super::VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 3,
                 index_count: 3,
                 material_index: 0,
@@ -3325,6 +3332,7 @@ mod tests {
     fn native_equal_key_insertion_uses_inclusive_midpoint() {
         let ranges = (0..4)
             .map(|index| super::super::VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: index * 3,
                 index_count: 3,
                 material_index: 0,
@@ -3419,6 +3427,7 @@ mod tests {
         const WEATHER: usize = 10;
         let ranges = (0..11)
             .map(|index| VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: index * 3,
                 index_count: 3,
                 material_index: 0,
@@ -3478,6 +3487,7 @@ mod tests {
         const WEATHER: usize = 10;
         let mut ranges = (0..11)
             .map(|index| VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: index * 3,
                 index_count: 3,
                 material_index: 0,
diff --git a/adapters/fparkan-render-vulkan/src/ffi/smoke_types.rs b/adapters/fparkan-render-vulkan/src/ffi/smoke_types.rs
index 90fd7b4..9fd0582 100644
--- a/adapters/fparkan-render-vulkan/src/ffi/smoke_types.rs
+++ b/adapters/fparkan-render-vulkan/src/ffi/smoke_types.rs
@@ -158,6 +158,8 @@ impl Default for VulkanDirectionalLight {
 /// One point light in the frame lighting contract.
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct VulkanPointLight {
+    /// Zero lights the world; a nonzero scope lights only matching object ranges.
+    pub owner_scope: u32,
     /// World-space position.
     pub position: [f32; 3],
     /// Light RGB multiplier.
@@ -173,6 +175,7 @@ pub struct VulkanPointLight {
 impl Default for VulkanPointLight {
     fn default() -> Self {
         Self {
+            owner_scope: 0,
             position: [0.0; 3],
             rgb: [0.0; 3],
             range: 0.0,
@@ -201,7 +204,7 @@ pub const VULKAN_FRAME_SLOT_COUNT: usize = 2;
 /// `uvec4` header bytes for the dynamic point-light storage buffer.
 pub const VULKAN_POINT_LIGHT_HEADER_BYTES: usize = 16;
 
-/// Three `vec4` records per dynamically uploaded point light.
+/// Two vec4 records, three attenuation floats and one u32 owner scope.
 pub const VULKAN_POINT_LIGHT_RECORD_BYTES: usize = 3 * 4 * std::mem::size_of::<f32>();
 
 /// Bytes occupied by one material's base and overlay specular records.
@@ -444,6 +447,8 @@ pub struct VulkanDynamicDrawRange {
 /// One indexed triangle-list draw retained from an original mesh batch.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub struct VulkanStaticDrawRange {
+    /// Root-object lighting scope; zero denotes terrain or unowned geometry.
+    pub owner_scope: u32,
     /// First index in the shared index buffer.
     pub first_index: u32,
     /// Number of indices in this draw.
@@ -787,6 +792,7 @@ impl VulkanStaticMesh {
             ],
             indices: vec![0, 1, 2],
             draw_ranges: vec![VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 0,
@@ -872,6 +878,7 @@ mod static_mesh_tests {
                 VulkanDirectionalLight::default(),
             ],
             point_light: VulkanPointLight {
+                owner_scope: 0,
                 position: [28.0, 29.0, 30.0],
                 rgb: [31.0, 32.0, 33.0],
                 range: 34.0,
@@ -1073,6 +1080,7 @@ mod static_mesh_tests {
             vertices: VulkanStaticMesh::smoke_triangle().vertices,
             indices: vec![0, 1],
             draw_ranges: vec![VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 2,
                 material_index: 0,
@@ -1105,6 +1113,7 @@ mod static_mesh_tests {
     fn material_descriptors_follow_source_batch_selectors() {
         let ranges = [
             VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 0,
                 index_count: 3,
                 material_index: 7,
@@ -1116,6 +1125,7 @@ mod static_mesh_tests {
                 alpha_test_reference: 0,
             },
             VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index: 3,
                 index_count: 3,
                 material_index: 2,
diff --git a/adapters/fparkan-render-vulkan/src/ffi/tests.rs b/adapters/fparkan-render-vulkan/src/ffi/tests.rs
index 4b2f7d2..8dda737 100644
--- a/adapters/fparkan-render-vulkan/src/ffi/tests.rs
+++ b/adapters/fparkan-render-vulkan/src/ffi/tests.rs
@@ -518,8 +518,9 @@ fn fragment_shader_dispatches_all_four_material_modes() {
 }
 
 #[test]
-fn point_light_storage_payload_is_counted_and_packed_as_three_vec4s() {
+fn point_light_storage_payload_preserves_integer_owner_scope_and_stride() {
     let lights = [VulkanPointLight {
+        owner_scope: 0x1234_5678,
         position: [1.0, 2.0, 3.0],
         rgb: [4.0, 5.0, 6.0],
         range: 7.0,
@@ -532,7 +533,7 @@ fn point_light_storage_payload_is_counted_and_packed_as_three_vec4s() {
         VULKAN_POINT_LIGHT_HEADER_BYTES + VULKAN_POINT_LIGHT_RECORD_BYTES
     );
     assert_eq!(u32::from_ne_bytes(bytes[0..4].try_into().unwrap()), 1);
-    let values = (0..12)
+    let values = (0..11)
         .map(|index| {
             let offset = VULKAN_POINT_LIGHT_HEADER_BYTES + index * std::mem::size_of::<f32>();
             f32::from_ne_bytes(bytes[offset..offset + 4].try_into().unwrap())
@@ -540,7 +541,11 @@ fn point_light_storage_payload_is_counted_and_packed_as_three_vec4s() {
         .collect::<Vec<_>>();
     assert_eq!(
         values,
-        vec![1.0, 2.0, 3.0, 7.0, 4.0, 5.0, 6.0, 1.0, 8.0, 9.0, 10.0, 1.0]
+        vec![1.0, 2.0, 3.0, 7.0, 4.0, 5.0, 6.0, 1.0, 8.0, 9.0, 10.0]
+    );
+    assert_eq!(
+        u32::from_ne_bytes(bytes[60..64].try_into().unwrap()),
+        0x1234_5678
     );
 
     let many = vec![VulkanPointLight::default(); 33];
diff --git a/apps/fparkan-game/src/main.rs b/apps/fparkan-game/src/main.rs
index 0d4fd0c..80585e1 100644
--- a/apps/fparkan-game/src/main.rs
+++ b/apps/fparkan-game/src/main.rs
@@ -723,6 +723,7 @@ struct AmbientEffectMeshPrimitive {
 
 #[derive(Clone, Debug)]
 struct ControlEffectSlot {
+    light_owner_scope: u32,
     time_mode: u32,
     header_flags: u32,
     random_instance_key: ControlEffectInstanceKey,
@@ -2757,6 +2758,7 @@ fn append_environment_range(
     let range_index = mesh.draw_ranges.len();
     mesh.draw_ranges
         .push(fparkan_render_vulkan::VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index,
             index_count,
             material_index,
@@ -5384,6 +5386,11 @@ fn update_control_point_lights(
         }
         lights.push((
             VulkanPointLight {
+                owner_scope: if frame.native_flags & 0x8000_0000 != 0 {
+                    slot.light_owner_scope
+                } else {
+                    0
+                },
                 position: frame.position,
                 rgb: [frame.color[0], frame.color[1], frame.color[2]],
                 range: frame.range,
@@ -5429,12 +5436,12 @@ fn report_control_point_lights_once(
     *reported = true;
 }
 
-fn ordinary_control_point_lights(
+fn active_control_point_lights(
     raw_control_lights: &[(VulkanPointLight, u32)],
 ) -> Vec<VulkanPointLight> {
     raw_control_lights
         .iter()
-        .filter(|(light, flags)| light.active && flags & 0x8000_0000 == 0)
+        .filter(|(light, _)| light.active)
         .map(|(light, _)| *light)
         .collect()
 }
@@ -5494,6 +5501,11 @@ fn append_initial_control_effect_slots(
     let Some(point_list) = control.point_list.as_ref() else {
         return Ok(());
     };
+    let light_owner_scope = u32::try_from(object_index)
+        .ok()
+        .and_then(|index| index.checked_add(1))
+        .ok_or_else(|| "Control light owner exceeds GPU scope range".to_string())?;
+    let initial_range_count = mesh.draw_ranges.len();
     let mut unsupported_commands = 0;
     let mut state_dependent_commands = 0;
     for row in
@@ -5620,6 +5632,7 @@ fn append_initial_control_effect_slots(
         for (command_index, command) in document.commands().iter().enumerate() {
             if ambient_effect_op1_supported(command) || command.opcode == FxOpcode::Op2 {
                 let slot = ControlEffectSlot {
+                    light_owner_scope,
                     time_mode: header.time_mode,
                     header_flags: header.flags,
                     random_instance_key,
@@ -5847,6 +5860,9 @@ fn append_initial_control_effect_slots(
             });
         }
     }
+    for range in &mut mesh.draw_ranges[initial_range_count..] {
+        range.owner_scope = light_owner_scope;
+    }
     eprintln!("render_coverage control_fx_unsupported={unsupported_commands} control_fx_requires_game_state={state_dependent_commands}");
     Ok(())
 }
@@ -7710,6 +7726,7 @@ fn project_basement_foundation(
                 .ok_or_else(|| "basement terrain draw range exceeds u32".to_string())?;
         } else {
             mesh.draw_ranges.push(VulkanStaticDrawRange {
+                owner_scope: 0,
                 first_index,
                 index_count: 3,
                 material_index,
@@ -8403,6 +8420,10 @@ fn static_preview_mesh_and_materials(
                 .map_err(|err| format!("project mission MSH for Vulkan: {err}"))?;
                 let component_handedness = native_msh_handedness(transform, mission_root.scale);
                 for range in &mut component.draw_ranges {
+                    range.owner_scope = u32::try_from(object_index)
+                        .ok()
+                        .and_then(|index| index.checked_add(1))
+                        .ok_or_else(|| "MSH light owner exceeds GPU scope range".to_string())?;
                     range.pipeline_state.cull =
                         native_msh_cull_mode(range.batch_flags, component_handedness);
                 }
@@ -10019,7 +10040,7 @@ impl StaticVulkanApp {
                     .control_clock_target_ms
                     .is_none_or(|target_ms| control_clock_ms >= target_ms),
         );
-        let control_vulkan_lights = ordinary_control_point_lights(&control_point_lights);
+        let control_vulkan_lights = active_control_point_lights(&control_point_lights);
         let effect_updates = update_ambient_effect_geometry(
             &mut self.ambient_effect_slots,
             &self.component_pose_buffers,
@@ -10433,6 +10454,7 @@ impl StaticVulkanApp {
                 .iter()
                 .find(|light| light.active)
                 .map(|light| VulkanPointLight {
+                    owner_scope: 0,
                     position: light.position,
                     rgb: [light.color[0], light.color[1], light.color[2]],
                     range: light.range,
@@ -10448,6 +10470,7 @@ impl StaticVulkanApp {
                 .iter()
                 .filter(|light| light.active)
                 .map(|light| VulkanPointLight {
+                    owner_scope: 0,
                     position: light.position,
                     rgb: [light.color[0], light.color[1], light.color[2]],
                     range: light.range,
@@ -11227,6 +11250,7 @@ mod tests {
         positions: &[[f32; 3]],
     ) -> (VulkanStaticMesh, VulkanStaticDrawRange) {
         let range = VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index: 0,
             index_count: u32::try_from(positions.len()).expect("fixture length fits u32"),
             material_index: 0,
@@ -12484,6 +12508,7 @@ mod tests {
                 .map(|index| index + environment_vertex_start),
         );
         let draw_range = |first_index, index_count| VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index,
             index_count,
             material_index: 0,
@@ -13196,6 +13221,7 @@ mod tests {
     #[test]
     fn draw_range_reorder_remaps_all_material_animation_bindings() {
         let range = |first_index, material_index| VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index,
             index_count: 3,
             material_index,
@@ -13261,6 +13287,7 @@ mod tests {
     #[test]
     fn native_world_transparency_uses_sampled_alpha_and_native_batch_flags() {
         let range = |blend, batch_flags| VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index: 0,
             index_count: 3,
             material_index: 0,
@@ -13624,6 +13651,7 @@ mod tests {
             row_index: 0,
         };
         let control_slot = ControlEffectSlot {
+            light_owner_scope: 1,
             time_mode: 1,
             header_flags: 9,
             random_instance_key: key,
@@ -13728,6 +13756,7 @@ mod tests {
                     .collect(),
                 indices: vec![0, 1, 2],
                 draw_ranges: vec![VulkanStaticDrawRange {
+                    owner_scope: 0,
                     first_index: 0,
                     index_count: 3,
                     material_index: 0,
@@ -16680,6 +16709,7 @@ mod tests {
     #[test]
     fn op1_control_lights_use_native_phase_owner_transform_and_flags() {
         let mut slot = ControlEffectSlot {
+            light_owner_scope: 1,
             time_mode: 1,
             header_flags: 0,
             random_instance_key: ControlEffectInstanceKey {
@@ -16754,6 +16784,10 @@ mod tests {
         assert_eq!(light.rgb, [0.25, 0.5, 0.75]);
         assert_eq!(light.range, 15.0);
         assert_eq!(light.coefficients, [1.0, 0.5, 0.25]);
+        assert_eq!(
+            light.owner_scope, 1,
+            "native local light reaches its owning root"
+        );
         assert_eq!(flags, 0xA000_0000);
         assert_eq!(
             [
@@ -16874,8 +16908,9 @@ mod tests {
     }
 
     #[test]
-    fn op1_generic_diffuse_list_excludes_bit31_and_clears_inactive_lights() {
-        let light = |position, active| VulkanPointLight {
+    fn op1_diffuse_list_retains_owner_lights_and_clears_inactive_lights() {
+        let light = |position, owner_scope, active| VulkanPointLight {
+            owner_scope,
             position,
             rgb: [0.25, 0.5, 0.75],
             range: 15.0,
@@ -16883,15 +16918,21 @@ mod tests {
             active,
         };
         let raw_records = vec![
-            (light([1.0, 2.0, 3.0], true), 0xA000_0000),
-            (light([4.0, 5.0, 6.0], true), 0x2000_0000),
-            (light([7.0, 8.0, 9.0], true), 0x8000_0000),
-            (light([10.0, 11.0, 12.0], false), 0x0000_0000),
+            (light([1.0, 2.0, 3.0], 5, true), 0xA000_0000),
+            (light([4.0, 5.0, 6.0], 0, true), 0x2000_0000),
+            (light([7.0, 8.0, 9.0], 2, true), 0x8000_0000),
+            (light([10.0, 11.0, 12.0], 0, false), 0x0000_0000),
         ];
 
-        let ordinary = ordinary_control_point_lights(&raw_records);
-        assert_eq!(ordinary.len(), 1);
-        assert_eq!(ordinary[0].position, [4.0, 5.0, 6.0]);
+        let active = active_control_point_lights(&raw_records);
+        assert_eq!(active.len(), 3);
+        assert_eq!(
+            active
+                .iter()
+                .map(|light| light.owner_scope)
+                .collect::<Vec<_>>(),
+            [5, 0, 2]
+        );
         assert_eq!(raw_records.len(), 4);
         assert_eq!(
             raw_records
@@ -16901,9 +16942,9 @@ mod tests {
             vec![0xA000_0000, 0x2000_0000, 0x8000_0000, 0]
         );
 
-        assert!(ordinary_control_point_lights(&[]).is_empty());
+        assert!(active_control_point_lights(&[]).is_empty());
         assert!(
-            ordinary_control_point_lights(&[(light([13.0, 14.0, 15.0], false), 0x2000_0000)])
+            active_control_point_lights(&[(light([13.0, 14.0, 15.0], 0, false), 0x2000_0000)])
                 .is_empty()
         );
     }
diff --git a/apps/fparkan-game/src/terrain_lod.rs b/apps/fparkan-game/src/terrain_lod.rs
index 190f660..1dd707d 100644
--- a/apps/fparkan-game/src/terrain_lod.rs
+++ b/apps/fparkan-game/src/terrain_lod.rs
@@ -233,6 +233,7 @@ mod tests {
     #[test]
     fn cell_ranges_keep_material_state_and_separate_generated_bands() {
         let range = VulkanStaticDrawRange {
+            owner_scope: 0,
             first_index: 0,
             index_count: 12,
             material_index: 7,
diff --git a/docs/appendices/knowledge-boundaries.md b/docs/appendices/knowledge-boundaries.md
index baf5ed5..103769c 100644
--- a/docs/appendices/knowledge-boundaries.md
+++ b/docs/appendices/knowledge-boundaries.md
@@ -87,6 +87,9 @@ Raw queue clock задаёт фазу волн отдельно от време
 Control Op1 пока использует цвет и радиус без случайных добавок команды;
 это явное приближение считается в `render_coverage control_op1_jitter_unsupported`.
 Масштаб радиуса длиной преобразованного направления и нижняя замена 0,01 восстановлены.
+Локальный флаг `0x80000000` сохраняет свет на MSH владельца, исключая его
+из общего света рельефа. Мерцание жёлтого источника над заводом ещё использует
+авторские цвет и радиус; порядок общего native RNG пока не воспроизводится.
 
 Control Op2 воспроизводит modes 0/2; modes 1/3, body+76 и неподдержанные
 time modes/привязки считаются как `render_coverage control_op2_unsupported`.
diff --git a/docs/reference/environment-effects.md b/docs/reference/environment-effects.md
index 0e709d9..2a17838 100644
--- a/docs/reference/environment-effects.md
+++ b/docs/reference/environment-effects.md
@@ -350,9 +350,12 @@ Renderer preview поддерживает FXID-команды Op3 modes 0–2, O
 Op3 mode0 строит camera-facing поверхность из анимируемых локальных позиции и
 масштаба; Op7/Op8 обновляют отдельные элементы particle pool; Op9 создаёт
 индексированную полусферическую сетку. Op1 вычисляется отдельно как список
-point lights: selector 1 и записи без `flags & 0x80000000` входят в общий
-diffuse light set. Записи с этим битом сохраняют native flags для специальных
-путей и projected shadows, но не добавляются в общий diffuse список.
+point lights: selector 1 без `flags & 0x80000000` освещает мир, а с этим битом —
+собственное строение или юнит. Локальный источник нельзя удалять из освещения
+MSH вместе с исключением из общего списка рельефа. Preview сохраняет исходные
+flags для projected shadows и передаёт в renderer область действия корневого
+объекта. Область ноль означает общий свет; у локального источника и диапазонов
+его модели одинаковый ненулевой идентификатор.
 
 Body discriminator Op3 читается из первого DWORD `FxCommand.raw_body`; offsets
 в evaluator-е относительны к данным после четырёхбайтового command word. Mode 1
diff --git a/docs/reference/render-frame.md b/docs/reference/render-frame.md
index ebe3971..8bd548f 100644
--- a/docs/reference/render-frame.md
+++ b/docs/reference/render-frame.md
@@ -126,6 +126,23 @@ RVA `0xF6E0`, преобразует направление текущей ма
 число таких Control-команд как `control_op1_jitter_unsupported` и использует
 их авторские значения. У синего источника в проверенном захвате добавки нулевые.
 
+Флаг источника `0x80000000` отделяет локальный свет объекта от общего света
+мира. В эталонной `Terrain.dll` (SHA-256
+`af87d1b2e728a0be73c52be3b44cc196ab46da7799f25a15d40f8c9b0b425ead`)
+`CLightManager` RVA `0x4C1D0` ведёт отдельные числа всех активных и общих
+источников; второй счётчик исключает этот бит. Живой вход `CShade` RVA
+`0x2E4A0` подтверждает различие: завод получает жёлтый источник с flags
+`0xA0000000`, а рельеф — только общие источники. Для выбранной вершины крыши
+native diffuse `1,205386/1,095748/1,893271` и specular после переноса переполнения
+`0,160597/0,147096/0,358346` воспроизводятся формулой shader с теми же входами
+с отклонением менее `0,0002`. Менять формулу блика для этого дефекта не нужно.
+
+В Vulkan каждый свет хранит `owner_scope` в последнем DWORD 48-байтовой
+SSBO-записи; область диапазона передаётся через `firstInstance`. Нулевая
+область света доступна всем диапазонам, ненулевая — только совпадающему
+владельцу. Terrain и геометрия без владельца имеют область ноль. Один общий
+буфер сохраняется; отдельные наборы света для каждого строения не создаются.
+
 ## Элемент отрисовки
 
 Подготовленный элемент отрисовки содержит:
diff --git a/docs/tomes/05-render.md b/docs/tomes/05-render.md
index 7cbe7d7..1329268 100644
--- a/docs/tomes/05-render.md
+++ b/docs/tomes/05-render.md
@@ -854,9 +854,13 @@ emit не должен повторно менять игровое состоя
 gate. Type 4 point list задаёт локальную матрицу; текущие MSH owner и mounted
 node poses входят в transform до локальной FX basis. Реализованные visuals
 охватывают Op3 modes 0–2, Op4, Op7/8 particle pools и Op9 generated mesh. Op1
-selector 1 добавляет point lights без native flag `0x80000000` в общий diffuse
-список; остальные active records сохраняют flags для специальных путей и
-projected shadows. Радиус источника масштабируется длиной его преобразованного
+selector 1 добавляет point lights в освещение. Native flag `0x80000000`
+ограничивает источник собственным объектом: такая лампа освещает завод, но
+не рельеф вокруг него. Это не запрет на обычный расчёт света. Потеря локального
+жёлтого источника над трубой делала крышу завода заметно холоднее оригинала.
+Renderer сопоставляет владельца лампы и диапазона MSH; общие источники
+доступны всем поверхностям. Исходные flags сохраняются также для projected
+shadows. Радиус источника масштабируется длиной его преобразованного
 направления до нормализации. Например, локальный радиус 7 при масштабе узла
 около 4,85 освещает область радиусом около 34. Потеря этого множителя оставляла
 синий свет завода почти незаметным. Неположительный итог заменяется на 0,01.